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RELATED PARTIES - Schedule of balances in relation to transactions with related parties (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 12, 2025
Dec. 10, 2025
Aug. 26, 2025
Dec. 31, 2024
ANTA Sports and subsidiaries          
Disclosure of transactions between related parties [line items]          
Amount payables to related parties   $ 147.0 $ 7.6 $ 0.5  
ANTA Sports and subsidiaries | Current payables          
Disclosure of transactions between related parties [line items]          
Amount payables to related parties $ 17.9       $ 11.3
ANTA Sports and subsidiaries | Current receivables          
Disclosure of transactions between related parties [line items]          
Accounts receivables to related parties 7.6       10.4
Key management personnel | Provisions short and long-term incentive          
Disclosure of transactions between related parties [line items]          
Amount payables to related parties 12.6       7.9
Key management personnel | Other short-term benefit liabilities          
Disclosure of transactions between related parties [line items]          
Amount payables to related parties 2.1       0.8
Entity controlled by a member of the board of directors of Amer Sports, Inc. | Right-of-use asset / Lease liability          
Disclosure of transactions between related parties [line items]          
Amount payables to related parties $ 0.7       $ 0.8